I bought an 08 yz250f a few days ago and I am trying to get the carb dialed in. It is in very good condition, so I am very happy with the purchase as it has 20 hours on it and I picked it up for 1800. He put in a quick adjust mix screw, boyesen qs3, and no toil powerflow kit. First of all I just took the carb off, disassembled cleaned and reassembled hoping the incredibly rich boggy bottom end would have been a plugged pilot or leak jet circuit. anyway, it runs alot better, but still is very rich bottom end and will stall out if you grab some throttle. when i first took off the carb I blipped the throttle and the squirt was very very long and strong, probably much to strong for the 250. My guess is that that is the problem. when you turn in the screw on the qs3 does that increase or decrease the squirt? I have the mix screw set at 2 and 1/4 turns out now and factory needle and clip position, a 175 main and factory pilot. any help and input will be greatly appreciated as I dont have alot of time to work on my bikes anymore. I would like to start riding more than tuning!